So the copy is at last pushed to developers for some fun of developing applications and other coding and stuff. The final release (RTM) is delayed because we are going to have beta 2 for developers before. It all was confirmed by Simpkins on Windows Team Blog

We’ve also pushed an OS update to the Microsoft Update servers this morning, allowing you to refresh retail Windows Phones that devs updated to Mango over the last month.

And about RTM

For the folks wondering why we’re not providing the ‘RTM’ version, there are two main reasons. First, the phone OS and the tools are two equal parts of the developer toolkit that correspond to one another. When we took this snapshot for the refresh, we took the latest RC drops of the tools and the corresponding OS version. Second, what we are providing is a genuine release candidate build, with enough code checked in and APIs locked down that this OS is close enough to RTM that, as a developer, it’s more than capable to see you through the upcoming RC drop of the tools and app submission. It’s important to remember that until the phone and mobile operator portion of Mango is complete, you’re still using a pre-release on your retail phone – no matter the MS build. Until that time, enjoy developing and cruising around on build 7712 – it’s a sweet ride, to be sure.

Emulator now has a nifty screenshot capability built in, allowing you quickly snap quality images of your app without the need of separate tools or cropping time. The images are great for use in app submission process or to share on your blog or with folks such as my team (hint hint).

The profiler has been greatly improved and provides memory profiling.

As of this drop, you can install NuGet into the free version of the WPSDK tools. I find NuGet to be one of my favorite productivity boosters and I’m happy to see the extension supported in the free tools.

The drop includes an initial peek at the Marketplace Test Kit; with the RC release, you’ll be able to use the included version of this toolkit to test your XAP file against the same certification testing tools that we use when ingesting apps for the Marketplace. For this refresh, it’s there but not fully functional; but more on this in a future blog post.

And how do we update ? Well the folks running already the Mango can get it and it will be updated via Zune.